We measured the AC susceptibility of magnetically textured (123) 80%/211(20%) DyBaCuO composite in a special set-up in order to enhance the intergrain contribution. The synthesis process led to very clean ... [more ▼]

We measured the AC susceptibility of magnetically textured (123) 80%/211(20%) DyBaCuO composite in a special set-up in order to enhance the intergrain contribution. The synthesis process led to very clean ''weak links'' at grain boundaries. At the percolation threshold bulk shielding paths were such that the intergrain critical current density J(c) was above 10(5) A/cm(2). The field dependence of J(c) was understood through an analytical form indicating a distribution of currents similar to the law of clusters at fracture/percolation thresholds. [less ▲]

A new compound of the high-temperature ceramic oxide superconductor family has been synthesized and analyzed, i.e., YBa1.95Cs0.05Cu3O7-y. Its crystallographic structure is given. Two well-defined ... [more ▼]

A new compound of the high-temperature ceramic oxide superconductor family has been synthesized and analyzed, i.e., YBa1.95Cs0.05Cu3O7-y. Its crystallographic structure is given. Two well-defined "critical regimes" are observed at 86 and 90 K, respectively, on electrical resistivity measurements. Magnetoresistivity measurements are also reported for small magnetic field. No anomalous hysteresis is found. Features in these transport properties are interpreted in terms of phase mixtures. The interest of such data is emphasized. [less ▲]